CA1215115A - Device for automatically compensating the magnetism of drill rods - Google Patents
Device for automatically compensating the magnetism of drill rodsInfo
- Publication number
- CA1215115A CA1215115A CA000449213A CA449213A CA1215115A CA 1215115 A CA1215115 A CA 1215115A CA 000449213 A CA000449213 A CA 000449213A CA 449213 A CA449213 A CA 449213A CA 1215115 A CA1215115 A CA 1215115A
- Authority
- CA
- Canada
- Prior art keywords
- rods
- sensor
- magnetic
- coil
- readings
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/025—Compensating stray fields
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/16—Drill collars
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/02—Determining slope or direction
- E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
Abstract
ABSTRACT OF THE DISCLOSURE
Device for automatically compensating the magnetism of drill rods.
Each end of the rods surrounding the positioning sensor is provided with a coil, through which passes a current, whose intensity is automatically regulated as a function of the sensor readings in order to make the gradient of the magnetic field due to the rods and to the field itself zero within the sensor area.
(Fig. 4)
Device for automatically compensating the magnetism of drill rods.
Each end of the rods surrounding the positioning sensor is provided with a coil, through which passes a current, whose intensity is automatically regulated as a function of the sensor readings in order to make the gradient of the magnetic field due to the rods and to the field itself zero within the sensor area.
(Fig. 4)
Description
DEVICE FOR AUTOMATICALLY COMPENSATING
THE MAGNETISM OF DRILL RODS
BACKGROUND OF THE INVENTION
. .
The present invention relates to techniques for drilling wells or shafts in the subsoil and more particularly to the case where the drilling cavity must at least partly be formed by areas having a certain curvature.
In this special case, it is sometimes necessary to guide the drilling tool into the curved areas by using markings obtained with the aid of magnetic measurements with respect to the direction and intensity of the geomagnetic field. When drilling takes place in highly curved areas, it is conventional practice to use drill rods constituted by solid or hollow cylindrical bars having e.g. a length of 20 to 50 m, for advancing the cutting tool into the drilling cavity. Unfortunately the motor of the tool, as well as the drill rods used for advancing it are generally made from highly ferromagnetic materials, such as iron or ordinary steel, and ~nsequently have a signify-cant magnetization. This magnetization ha the serious defect of interfering with the ambient magnetic field and consequently of falsifying the readings of the positioning sensor with respect to the geomagnetic field if said sensor is positioned in the vicinity of the drill rods, which is necessary in practice.
., En 7854 . 3 AM
~5~5 Hitherto the solution adopted to overcome this problem has consisted of using non magnetic stainless steel for making the drill rods closest to the positioning sensor. Us-fortunately this metal is very expensive so that this solution is not ideal.
SEYMOUR OF THE INVENT LO
.
The object of the present invention is a device for automatically compensating the magnetism of drill rods making it possible to compensate the harmful magnetic effect of these rods at the very magnetic field sensors which control the positioning of the drilling tool by using easily and inexpensively produced means.
This object is achieved by a device for automatically compensating the magnetism of the drill rods of the type formed by solid or hollow, cylindrical, magnetic material bars, for advancing by gravity the drilling tool, which is guided in its advance by the readings of a positioning sensor relative to the go-magnetic field, wherein each end of the rods surrounding the positioning sensor is provided with a coil, through which passe a current, whose intensity is automatically regulated, as a function of the sensor readings, in order to make the gradient of the magnetic field due to the rods and to the actual field zero, within the area of the sensor.
Thus, the device according to the invention, which only uses a short coil placed at the ends I
of the two rods closest to the sensor, makes it possible to magnetize in the opposite direction to the magnetization induced by the geomagnetic field, that part of the material constituting the rods, in such a way that, in the vicinity of the said ends there is an area where the magnetic field gradient due to the rods is zero. Moreover if care is also taken in choosing the length of the coil, the position of the field measuring point, i.e.
that of the sensor relative to the rod and the intensity of the current passing through the coil, it is also possible to easily ensure that the interference field is zero at the point where the positioning sensor is located.
Thus, the magnetic field due to the rods and the gradient of said field are zero in the area of the sensor.
According to an interesting variant of the present invention, the positioning sensor come proses 9 in a hollow, cylindrical, magnetic material sleeve, two magnetic probes located at a distance x at the end of the rod and at a distance ox from one another, a differential amplifier determining the difference in the readings supplied by the two probes and con-trolling with the aid of said difference the current generator, which regulates the intensity passing through the coil to a value such that the gradient of the magnetic field due to the rods and -the actual field is zero at distance x from said rod.
Thus, according to the invention, use is made ox the magnetic field gradient between two adjacent magnetic proves to automatically regulate the current flowing through the coil so that, by design, the interference field is made zero at this point. Once this result has been achieved, it is certain that the readings of the drilling tool positioning sensor are no longer interfered with compared with the geomagnetic field and use can be made thereof for controlling the advance of the drilling tool in the desired direction for the cavity.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in greater detail hereinafter relative to non-limitative embodiments of the automatic compensating dew-ice and with reference to the attached Figs. 1 to 4, wherein show:
Fig. 1 diagrammatically in a drilling well having a certain curvature, the position of the drill rods surrounding the magnetic positioning sensor and advancing the drilling equipment.
Fig. 2 very diagrammatically, the automatic compensating device according to the invention in the case where it is placed at the end of the final rod preceding the drilling tool.
Fig. 3 diagrammatically the automatic come sensating device according to the invention in the case where it is positioned at the two ends of two adjacent rods surrounding the magnetic positioning sensor.
Fig. 4 in greater detail, the embodiment of jig. 2.
5 DETAILED DESCRIPTION OF THE PREFERRED EM_ IMENTS
Fig. 1 shows the ground surface 1 and the drilling well or shaft 2, which acquires a certain curvature over the path 3. Drilling well
THE MAGNETISM OF DRILL RODS
BACKGROUND OF THE INVENTION
. .
The present invention relates to techniques for drilling wells or shafts in the subsoil and more particularly to the case where the drilling cavity must at least partly be formed by areas having a certain curvature.
In this special case, it is sometimes necessary to guide the drilling tool into the curved areas by using markings obtained with the aid of magnetic measurements with respect to the direction and intensity of the geomagnetic field. When drilling takes place in highly curved areas, it is conventional practice to use drill rods constituted by solid or hollow cylindrical bars having e.g. a length of 20 to 50 m, for advancing the cutting tool into the drilling cavity. Unfortunately the motor of the tool, as well as the drill rods used for advancing it are generally made from highly ferromagnetic materials, such as iron or ordinary steel, and ~nsequently have a signify-cant magnetization. This magnetization ha the serious defect of interfering with the ambient magnetic field and consequently of falsifying the readings of the positioning sensor with respect to the geomagnetic field if said sensor is positioned in the vicinity of the drill rods, which is necessary in practice.
., En 7854 . 3 AM
~5~5 Hitherto the solution adopted to overcome this problem has consisted of using non magnetic stainless steel for making the drill rods closest to the positioning sensor. Us-fortunately this metal is very expensive so that this solution is not ideal.
SEYMOUR OF THE INVENT LO
.
The object of the present invention is a device for automatically compensating the magnetism of drill rods making it possible to compensate the harmful magnetic effect of these rods at the very magnetic field sensors which control the positioning of the drilling tool by using easily and inexpensively produced means.
This object is achieved by a device for automatically compensating the magnetism of the drill rods of the type formed by solid or hollow, cylindrical, magnetic material bars, for advancing by gravity the drilling tool, which is guided in its advance by the readings of a positioning sensor relative to the go-magnetic field, wherein each end of the rods surrounding the positioning sensor is provided with a coil, through which passe a current, whose intensity is automatically regulated, as a function of the sensor readings, in order to make the gradient of the magnetic field due to the rods and to the actual field zero, within the area of the sensor.
Thus, the device according to the invention, which only uses a short coil placed at the ends I
of the two rods closest to the sensor, makes it possible to magnetize in the opposite direction to the magnetization induced by the geomagnetic field, that part of the material constituting the rods, in such a way that, in the vicinity of the said ends there is an area where the magnetic field gradient due to the rods is zero. Moreover if care is also taken in choosing the length of the coil, the position of the field measuring point, i.e.
that of the sensor relative to the rod and the intensity of the current passing through the coil, it is also possible to easily ensure that the interference field is zero at the point where the positioning sensor is located.
Thus, the magnetic field due to the rods and the gradient of said field are zero in the area of the sensor.
According to an interesting variant of the present invention, the positioning sensor come proses 9 in a hollow, cylindrical, magnetic material sleeve, two magnetic probes located at a distance x at the end of the rod and at a distance ox from one another, a differential amplifier determining the difference in the readings supplied by the two probes and con-trolling with the aid of said difference the current generator, which regulates the intensity passing through the coil to a value such that the gradient of the magnetic field due to the rods and -the actual field is zero at distance x from said rod.
Thus, according to the invention, use is made ox the magnetic field gradient between two adjacent magnetic proves to automatically regulate the current flowing through the coil so that, by design, the interference field is made zero at this point. Once this result has been achieved, it is certain that the readings of the drilling tool positioning sensor are no longer interfered with compared with the geomagnetic field and use can be made thereof for controlling the advance of the drilling tool in the desired direction for the cavity.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in greater detail hereinafter relative to non-limitative embodiments of the automatic compensating dew-ice and with reference to the attached Figs. 1 to 4, wherein show:
Fig. 1 diagrammatically in a drilling well having a certain curvature, the position of the drill rods surrounding the magnetic positioning sensor and advancing the drilling equipment.
Fig. 2 very diagrammatically, the automatic compensating device according to the invention in the case where it is placed at the end of the final rod preceding the drilling tool.
Fig. 3 diagrammatically the automatic come sensating device according to the invention in the case where it is positioned at the two ends of two adjacent rods surrounding the magnetic positioning sensor.
Fig. 4 in greater detail, the embodiment of jig. 2.
5 DETAILED DESCRIPTION OF THE PREFERRED EM_ IMENTS
Fig. 1 shows the ground surface 1 and the drilling well or shaft 2, which acquires a certain curvature over the path 3. Drilling well
2 contains the drilling tool 49 which can e.g.
be a drilling bit or some equivalent tool.
As explained herein before, the tool 4 is preceded in the drilling shaft 2 by a certain number of drill rods 5 (in this case three rods), which are in fact ordinary magnetic steel or iron hollow or solid bars having a length of 20 to 50 m and a diameter of approximately 20 cm, permitting their passage in a manner compatible with the curvature of region 3 of the drilling well. The object of these drill rods, which have a considerable weight, is to bear on the drilling tool 4 whilst advancing it by gravity. The positioning sensor 6 is positioned between rods pa and 5b, which makes it possible to orient the advance of tool 4 by providing a spatial marking relative -to the geomagnetic field direction at the point where it is positioned. According to the invention, the ends of drill rods pa and 5b adjacent to the positioning sensor are in each case provided with a coil pa, 7b respectively, through which passes a current, whose intensity is automatically regulated as a function of ~5~5 the readings of sensor 6, so as to make zero in the region of said sensor both the magnetic field due to the rods and its gradient. There-fore, it is ensured that the positioning sensor undergoes no interference in its marking relative to the geomagnetic field as a result of the adjacent drill rods pa, jab. A more detailed explanation is given hereinafter with reference to Fig. 4 of the way in which the positioning sensor 6 regulates the currents flowing through coil pa, 7b in order to achieve this result.
Fig. 2 shows an embodiment of the device according to the invention, in which the positioning sensor 6 is placed directly between the drilling tool 4 and the adjacent drill rod pa. In this particular case, a single coil 7 is provided at the end of rod pa in the vicinity of sensor 6.
Fig. 3 shows another embodiment corresponding to that of Fig. 1, in which sensor 6 is inserted between adjacent rods pa, 5b, the drilling tool 4 being at the top ox the device, at the end of rod 5b, which does not contain a coil. The two coils pa, 7b of Fig. 1 are once again present here.
Fig. 4 shows in greater detail the diagram of an automatic compensating device according to the invention, which, along the drilling axis 8, has the end of a drill rod 5, a coil 7 and a hollow cylindrical sleeve made prom magnetic material and which contains the two Lo 5 local magnetic field detecting probes 10, 11, Probe 10 is at a distance x from the nearest end of rod 5, and the distance between probes 10 and 11 is . In order to further define the reciprocal magnitudes of the elements present, reference will be made to an example in which the drill rod 5 has a diameter of 20 cm, coil 7 a diameter of 25 cm, and in which the distance x is 55 cm for a coil 7 of length of 80 cm. In this example, the second sensor 11 is located at a distance of 5 cm from the first sensor 10, which means that the average value for the ratio hex is approximately 1/10. The reciprocal positioning of the two probes 10 and 11 is ensured by the hollow magnetic material tube 9, which has the same function as the non-magnetic rod conventionally used according to the prior art for removing the positioning sensor from the magnetic field produced by the drill rods 5. However, in the present case it is much shorter, its length being e.g. approximately 1 m instead of 20 m, which is the usual length with such rods. Its length is in fact dependent on the dimension x separating the first sensor 10 from the end of rod 5, which is itself a function of the length 1 of coil 70 The drilling tool is not shown in Fig. I.
The hollow cylindrical sleeve 9 also con-twins the differential amplifier 12 and the current generator control 13 which, for reasons of clarity in the drawing, are shown outside sleeve 9. By means of the two connections 1 s and 15, differential amplifier 12 receives the respective readings of sensors 10 and 11, and determines their difference, which it amplifies. This difference is then transmitted by line 16 to the current generator control 13, which supplies the turns of coil 7 via con-doctor 17. Thus, the differential amplifier 12 behaves in the same way as a zero detector, i.e. it stabilizes the current supplied by generator 13 to the coil 7 to a constant value as soon as the readings received on lines 14 and 15 are the same. Probe then supplies the axial value of the geomagnetic field, which has been made strictly independent of any magnetic influence due to the drill rods 5 or the drilling tool.
The energy source necessary lo. the operation of the system can be either a battery or a accumulator located inside the hollow cylindrical sleeve 9 or even outside the drilling system.
be a drilling bit or some equivalent tool.
As explained herein before, the tool 4 is preceded in the drilling shaft 2 by a certain number of drill rods 5 (in this case three rods), which are in fact ordinary magnetic steel or iron hollow or solid bars having a length of 20 to 50 m and a diameter of approximately 20 cm, permitting their passage in a manner compatible with the curvature of region 3 of the drilling well. The object of these drill rods, which have a considerable weight, is to bear on the drilling tool 4 whilst advancing it by gravity. The positioning sensor 6 is positioned between rods pa and 5b, which makes it possible to orient the advance of tool 4 by providing a spatial marking relative -to the geomagnetic field direction at the point where it is positioned. According to the invention, the ends of drill rods pa and 5b adjacent to the positioning sensor are in each case provided with a coil pa, 7b respectively, through which passes a current, whose intensity is automatically regulated as a function of ~5~5 the readings of sensor 6, so as to make zero in the region of said sensor both the magnetic field due to the rods and its gradient. There-fore, it is ensured that the positioning sensor undergoes no interference in its marking relative to the geomagnetic field as a result of the adjacent drill rods pa, jab. A more detailed explanation is given hereinafter with reference to Fig. 4 of the way in which the positioning sensor 6 regulates the currents flowing through coil pa, 7b in order to achieve this result.
Fig. 2 shows an embodiment of the device according to the invention, in which the positioning sensor 6 is placed directly between the drilling tool 4 and the adjacent drill rod pa. In this particular case, a single coil 7 is provided at the end of rod pa in the vicinity of sensor 6.
Fig. 3 shows another embodiment corresponding to that of Fig. 1, in which sensor 6 is inserted between adjacent rods pa, 5b, the drilling tool 4 being at the top ox the device, at the end of rod 5b, which does not contain a coil. The two coils pa, 7b of Fig. 1 are once again present here.
Fig. 4 shows in greater detail the diagram of an automatic compensating device according to the invention, which, along the drilling axis 8, has the end of a drill rod 5, a coil 7 and a hollow cylindrical sleeve made prom magnetic material and which contains the two Lo 5 local magnetic field detecting probes 10, 11, Probe 10 is at a distance x from the nearest end of rod 5, and the distance between probes 10 and 11 is . In order to further define the reciprocal magnitudes of the elements present, reference will be made to an example in which the drill rod 5 has a diameter of 20 cm, coil 7 a diameter of 25 cm, and in which the distance x is 55 cm for a coil 7 of length of 80 cm. In this example, the second sensor 11 is located at a distance of 5 cm from the first sensor 10, which means that the average value for the ratio hex is approximately 1/10. The reciprocal positioning of the two probes 10 and 11 is ensured by the hollow magnetic material tube 9, which has the same function as the non-magnetic rod conventionally used according to the prior art for removing the positioning sensor from the magnetic field produced by the drill rods 5. However, in the present case it is much shorter, its length being e.g. approximately 1 m instead of 20 m, which is the usual length with such rods. Its length is in fact dependent on the dimension x separating the first sensor 10 from the end of rod 5, which is itself a function of the length 1 of coil 70 The drilling tool is not shown in Fig. I.
The hollow cylindrical sleeve 9 also con-twins the differential amplifier 12 and the current generator control 13 which, for reasons of clarity in the drawing, are shown outside sleeve 9. By means of the two connections 1 s and 15, differential amplifier 12 receives the respective readings of sensors 10 and 11, and determines their difference, which it amplifies. This difference is then transmitted by line 16 to the current generator control 13, which supplies the turns of coil 7 via con-doctor 17. Thus, the differential amplifier 12 behaves in the same way as a zero detector, i.e. it stabilizes the current supplied by generator 13 to the coil 7 to a constant value as soon as the readings received on lines 14 and 15 are the same. Probe then supplies the axial value of the geomagnetic field, which has been made strictly independent of any magnetic influence due to the drill rods 5 or the drilling tool.
The energy source necessary lo. the operation of the system can be either a battery or a accumulator located inside the hollow cylindrical sleeve 9 or even outside the drilling system.
Claims (3)
1. A device for automatically compensating the magnetism of the drill rods of the type formed by solid or hollow, cylindrical, magnetic material bars, for advancing by gravity the drilling tool, which is guided in its advance by the readings of a positioning sensor relative to the geomagnetic field, wherein each end of the rods surrounding the position-ing sensor is provided with a coil, through which passes a current, whose intensity is automatic-ally regulated, as a function of the sensor readings, in order to make the gradient of the magnetic field due to the rods and to the actual field zero, within the area of the sensor.
2. An automatic compensating device according to claim 1, wherein the positioning sensor com-prises, in a hollow, cylindrical, amagnetic material sleeve, two magnetic probes located at a distance x at the end of the rod and at a distance .DELTA.x from one another, a differential amplifier determining the difference in the readings supplied by the two probes and con-trolling with the aid of said difference the current generator, which regulates the intensity passing through the coil to a value such that the gradient of the magnetic field due to the rods and the actual field is zero at distance x from said rod.
3. An automatic compensating device according to claim 2, wherein one of the two magnetic probes is a triaxial sensor oriented in accordance with a trirectangular trihedron and whereof one of the axes is oriented along the drill rod axis.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8304036A FR2542365B1 (en) | 1983-03-11 | 1983-03-11 | DEVICE FOR AUTOMATICALLY COMPENSATING FOR MAGNETISM OF WELL LINES |
| FR8304036 | 1983-03-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1215115A true CA1215115A (en) | 1986-12-09 |
Family
ID=9286758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000449213A Expired CA1215115A (en) | 1983-03-11 | 1984-03-09 | Device for automatically compensating the magnetism of drill rods |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4649349A (en) |
| EP (1) | EP0122823B1 (en) |
| JP (1) | JPS59170392A (en) |
| CA (1) | CA1215115A (en) |
| DE (1) | DE3464272D1 (en) |
| FR (1) | FR2542365B1 (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3403982A1 (en) * | 1984-02-04 | 1985-08-08 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | METHOD FOR AN EMERGENCY-FIELD-CONTROLLED MAGNETIC PROTECTIVE SYSTEM (SMES SYSTEM) |
| GB8504949D0 (en) * | 1985-02-26 | 1985-03-27 | Shell Int Research | Determining azimuth of borehole |
| GB8906233D0 (en) * | 1989-03-17 | 1989-05-04 | Russell Anthony W | Surveying of boreholes |
| GB2241583A (en) * | 1990-03-03 | 1991-09-04 | Baroid Technology Inc | Determination of magnetic interference in a borehole |
| CA2024429A1 (en) * | 1990-08-31 | 1992-03-01 | Vladimir M. Labuc | Borehole deviation monitor |
| US5155916A (en) * | 1991-03-21 | 1992-10-20 | Scientific Drilling International | Error reduction in compensation of drill string interference for magnetic survey tools |
| US5273116A (en) * | 1992-02-14 | 1993-12-28 | Baker Hughes Incorporated | Firing mechanism for actuating wellbore tools |
| US5258755A (en) * | 1992-04-27 | 1993-11-02 | Vector Magnetics, Inc. | Two-source magnetic field guidance system |
| US5321893A (en) * | 1993-02-26 | 1994-06-21 | Scientific Drilling International | Calibration correction method for magnetic survey tools |
| CA2134191C (en) * | 1993-11-17 | 2002-12-24 | Andrew Goodwin Brooks | Method of correcting for axial and transverse error components in magnetometer readings during wellbore survey operations |
| US5452518A (en) * | 1993-11-19 | 1995-09-26 | Baker Hughes Incorporated | Method of correcting for axial error components in magnetometer readings during wellbore survey operations |
| AU678406B2 (en) * | 1994-01-11 | 1997-05-29 | Aldridge Traffic Controllers Pty Limited | Attitude sensor |
| US8441330B2 (en) * | 2010-03-23 | 2013-05-14 | D-Wave Systems Inc. | Systems and methods for magnetic shielding |
| US8947094B2 (en) * | 2011-07-18 | 2015-02-03 | Schlumber Technology Corporation | At-bit magnetic ranging and surveying |
| AP2014007984A0 (en) | 2012-03-12 | 2014-10-31 | Globaltech Corp Pty Ltd | Improvements to downhole surveying |
| US10755190B2 (en) | 2015-12-21 | 2020-08-25 | D-Wave Systems Inc. | Method of fabricating an electrical filter for use with superconducting-based computing systems |
| GB2587944B (en) | 2018-08-02 | 2022-07-06 | Halliburton Energy Services Inc | Inferring orientation parameters of a steering system for use with a drill string |
| GB2600334B (en) | 2019-07-18 | 2023-05-17 | Baker Hughes Oilfield Operations Llc | Correction of gyroscopic measurements for directional drilling |
| US11802476B2 (en) * | 2019-11-14 | 2023-10-31 | Baker Hughes Oilfield Operations Llc | Variation H coils calibration method for triaxial magnetometers |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2735063A (en) * | 1956-02-14 | Total field magnetometer | ||
| US3311821A (en) * | 1962-12-11 | 1967-03-28 | Canadair Ltd | Apparatus for automatically compensating the output of a magnetic field sensing device for the effects of interfering magnetic fields |
| FR1485557A (en) * | 1966-02-04 | 1967-06-23 | Commissariat Energie Atomique | Improvements in methods and devices for compensating parasitic magnetic fields, in particular in an airplane transporting a magnetometer |
| US3406766A (en) * | 1966-07-07 | 1968-10-22 | Henderson John Keller | Method and devices for interconnecting subterranean boreholes |
| BE755895A (en) * | 1969-09-24 | 1971-02-15 | Commissariat Energie Atomique | METHOD AND DEVICE FOR COMPENSATION OF THE INFLUENCE OF PARASITE FIELDS OF A HELICOPTER |
| GB1342475A (en) * | 1970-11-11 | 1974-01-03 | Russell A W | Directional drilling of boreholes |
| US3731752A (en) * | 1971-06-25 | 1973-05-08 | Kalium Chemicals Ltd | Magnetic detection and magnetometer system therefor |
| GB1474751A (en) * | 1975-07-23 | 1977-05-25 | Ferranti Ltd | Angle measurement |
| GB1578053A (en) * | 1977-02-25 | 1980-10-29 | Russell Attitude Syst Ltd | Surveying of boreholes |
| GB2070105B (en) * | 1980-02-26 | 1983-10-19 | Shell Int Research | Equipment for drilling a hole in underground formations and downhole motor adapted to form part of such equipment |
| US4463314A (en) * | 1980-07-28 | 1984-07-31 | Westinghouse Electric Corp. | Earth field compensation for a magnetic detector by imparting a permanent magnetization to a magnetic material contiguous the detector |
| US4529939A (en) * | 1983-01-10 | 1985-07-16 | Kuckes Arthur F | System located in drill string for well logging while drilling |
-
1983
- 1983-03-11 FR FR8304036A patent/FR2542365B1/en not_active Expired
-
1984
- 1984-03-01 US US06/585,183 patent/US4649349A/en not_active Expired - Lifetime
- 1984-03-05 EP EP84400433A patent/EP0122823B1/en not_active Expired
- 1984-03-05 DE DE8484400433T patent/DE3464272D1/en not_active Expired
- 1984-03-09 CA CA000449213A patent/CA1215115A/en not_active Expired
- 1984-03-12 JP JP59045721A patent/JPS59170392A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR2542365B1 (en) | 1985-10-25 |
| US4649349A (en) | 1987-03-10 |
| FR2542365A1 (en) | 1984-09-14 |
| EP0122823A1 (en) | 1984-10-24 |
| DE3464272D1 (en) | 1987-07-23 |
| JPS59170392A (en) | 1984-09-26 |
| EP0122823B1 (en) | 1987-06-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1215115A (en) | Device for automatically compensating the magnetism of drill rods | |
| CA1186733A (en) | Well casing detector system and method | |
| US5513710A (en) | Solenoid guide system for horizontal boreholes | |
| US6768299B2 (en) | Downhole magnetic-field based feature detector | |
| US5751144A (en) | Method and device including primary and auxiliary magnetic poles for nondestructive detection of structural faults | |
| CA2394867C (en) | Method for magnetizing wellbore tubular | |
| US5670878A (en) | Inspecting a conductive object with a steady state magnetic field and induced eddy current | |
| WO1996014491A9 (en) | Solenoid guide system for horizontal boreholes | |
| US8471556B2 (en) | Magnetic probe and processes of analysis | |
| EP0387991A3 (en) | Surveying of boreholes | |
| CA1164515A (en) | Linear magnetic bearings | |
| US3443211A (en) | Magnetometer inspection apparatus for ferromagnetic objects | |
| US5130655A (en) | Multiple-coil magnetic field sensor with series-connected main coils and parallel-connected feedback coils | |
| DE10026313A1 (en) | Defect detection method for elongated ferromagnetic object, e.g. steel wire cable, uses magnetization and detection of magnetic field parameters at spaced points | |
| SE8704129D0 (en) | DEVICE FOR LOCATING RODS BURIED IN HIGH-DENSITY REINFORCED CONCRETE | |
| US6639398B2 (en) | Magnetic sensor that concentrates magnetic flux in an air gap | |
| US5187435A (en) | Non-destructive test apparatus with eddy current transducer rotary head and field homogenizing conductive ring for scanning metal test materials | |
| US3757209A (en) | Compensation for misalignment of magnetic sensors | |
| EP0024307B1 (en) | Device for compensating the magnetic field of disturbance of an object by means of a magnetic self-protection arrangement | |
| US3721984A (en) | Magnetometer employing magnetically suspended body | |
| US3007109A (en) | Apparatus for detecting casing joints | |
| US4709208A (en) | Magnetic mark detector system | |
| GB2405212A (en) | Downhole magnetic field based feature detector | |
| US3657636A (en) | Thermally stable coil assembly for magnetic susceptibility logging | |
| EP1189076A2 (en) | Method for locating objects and detecting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |